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Segment and Related Information, Reportable Segments (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jul. 01, 2018 USD ($) | Apr. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) | Jul. 02, 2017 USD ($) | Apr. 02, 2017 USD ($) | Dec. 31, 2018 USD ($) Segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment and Related Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  |  | 4 |  |
Segment Reporting Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 447.5 | $ 464.1 | $ 464.7 | $ 431.3 | $ 432.1 | $ 424.5 | $ 414.1 | $ 405.0 | $ 1,807.6 | $ 1,675.7 | $ 1,638.0
Income from operations | 62.3 | 68.2 | 62.8 | 62.6 | 46.1 | 67.2 | 69.0 | 62.1 | 255.9 | 244.4 | 223.9
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 94.3 | 91.0 | 91.9
Segment assets | 3,087.1 |  |  |  | 2,970.4 |  |  |  | 3,087.1 | 2,970.4 | 2,863.4
Capital expenditures |  |  |  |  |  |  |  |  | 75.9 | 76.7 | 62.4
Income from operations before provision (benefit) for taxes on income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Acquisition related transaction and integration costs |  |  |  |  |  |  |  |  | (1.7) | (3.4) | (8.0)
Unallocated corporate expenses |  |  |  |  |  |  |  |  | (4.5) | (6.7) | (3.0)
Consolidated income from operations | 62.3 | 68.2 | 62.8 | 62.6 | 46.1 | 67.2 | 69.0 | 62.1 | 255.9 | 244.4 | 223.9
Non-operating deductions, net |  |  |  |  |  |  |  |  | (51.8) | (53.5) | (53.6)
Income from operations before provision (benefit) for taxes on income |  |  |  |  |  |  |  |  | 204.1 | 190.9 | 170.3
Performance Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | 206.8 | 219.5 | 214.5 | 187.3 | 195.8 | 188.8 | 180.3 | 169.9 | 828.1 | 734.8 | 686.1
Specialty Minerals [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | 142.5 | 146.3 | 150.9 | 149.6 | 143.9 | 147.7 | 147.0 | 146.2 | 589.3 | 584.8 | 591.5
Refractories [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | 77.9 | 79.1 | 79.6 | 75.3 | 71.3 | 69.0 | 68.9 | 70.2 | 311.9 | 279.4 | 274.5
Energy Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | 20.3 | $ 19.2 | $ 19.7 | $ 19.1 | 21.1 | $ 19.0 | $ 17.9 | $ 18.7 | 78.3 | 76.7 | 85.9
Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,807.6 | 1,675.7 | 1,638.0
Income from operations |  |  |  |  |  |  |  |  | 262.1 | 254.5 | 234.9
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 94.3 | 91.0 | 91.9
Segment assets | 3,038.6 |  |  |  | 2,927.0 |  |  |  | 3,038.6 | 2,927.0 | 2,821.9
Capital expenditures |  |  |  |  |  |  |  |  | 74.7 | 76.1 | 60.5
Income from operations before provision (benefit) for taxes on income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Consolidated income from operations |  |  |  |  |  |  |  |  | 262.1 | 254.5 | 234.9
Reportable Segments [Member] | Performance Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 828.1 | 734.8 | 686.1
Income from operations |  |  |  |  |  |  |  |  | 116.8 | 119.7 | 121.1
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 41.1 | 40.5 | 38.9
Segment assets | 2,119.7 |  |  |  | 1,989.6 |  |  |  | 2,119.7 | 1,989.6 | 1,942.1
Capital expenditures |  |  |  |  |  |  |  |  | 22.4 | 33.1 | 12.8
Income from operations before provision (benefit) for taxes on income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Consolidated income from operations |  |  |  |  |  |  |  |  | 116.8 | 119.7 | 121.1
Reportable Segments [Member] | Specialty Minerals [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 589.3 | 584.8 | 591.5
Income from operations |  |  |  |  |  |  |  |  | 95.4 | 88.9 | 102.7
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 38.2 | 35.5 | 34.9
Segment assets | 511.9 |  |  |  | 519.4 |  |  |  | 511.9 | 519.4 | 491.7
Capital expenditures |  |  |  |  |  |  |  |  | 42.4 | 32.6 | 40.4
Income from operations before provision (benefit) for taxes on income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Consolidated income from operations |  |  |  |  |  |  |  |  | 95.4 | 88.9 | 102.7
Reportable Segments [Member] | Refractories [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 311.9 | 279.4 | 274.5
Income from operations |  |  |  |  |  |  |  |  | 45.4 | 39.8 | 37.0
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 6.6 | 6.8 | 6.9
Segment assets | 296.6 |  |  |  | 307.4 |  |  |  | 296.6 | 307.4 | 283.4
Capital expenditures |  |  |  |  |  |  |  |  | 5.0 | 5.9 | 5.9
Income from operations before provision (benefit) for taxes on income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Consolidated income from operations |  |  |  |  |  |  |  |  | 45.4 | 39.8 | 37.0
Reportable Segments [Member] | Energy Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 78.3 | 76.7 | 85.9
Income from operations |  |  |  |  |  |  |  |  | 4.5 | 6.1 | (25.9)
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 8.4 | 8.2 | 11.2
Segment assets | 110.4 |  |  |  | 110.6 |  |  |  | 110.4 | 110.6 | 104.7
Capital expenditures |  |  |  |  |  |  |  |  | 4.9 | 4.5 | 1.4
Income from operations before provision (benefit) for taxes on income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Consolidated income from operations |  |  |  |  |  |  |  |  | 4.5 | 6.1 | (25.9)
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment assets | $ 48.5 |  |  |  | $ 43.4 |  |  |  | 48.5 | 43.4 | 41.5
Capital expenditures |  |  |  |  |  |  |  |  | $ 1.2 | $ 0.6 | $ 1.9

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